gst-examples Issue: Required gstreamer plugin 'nice' not found

[Terence Darwen]

I'm trying to run the webrtc-sendrecv example here:
https://gitlab.freedesktop.org/gstreamer/gst-examples/-/blob/master/webrtc/sendrecv/gst/webrtc-sendrecv.c

I've followed the instructions and have successfully built the
webrtc-sendrecv executable, but when running it I get a "Required gstreamer
plugin 'nice' not found" error.

I've manually built gstreamer v1.19.1, base plugins and the good /bad/ugly
plugins, as well as manually built and installed libnice as instructed here
https://github.com/libnice/libnice but still get this plug-in error.

I'm using Ubuntu 18.04.3 LTS for this.

Any advice would be appreciated.
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